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Aim

Theory

Self Evaluation

Procedure

Simulation

Assignment

References

Feedback

Franck-Hertz Experiment

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The specific charge of cathode rays

a: Depends on the applied voltage Explanation

Explanation

b: Depends on the nature of the gas in the tube Explanation

Explanation

c: Is a constant Explanation

Explanation

d: Depends on the metal used for cathode Explanation

Explanation

Cathode rays are

a: Fast moving neutrons Explanation

Explanation

b: Fast moving protons Explanation

Explanation

c: Fast moving electrons Explanation

Explanation

d: Electromagnetic waves Explanation

Explanation

What was the primary conclusion drawn from the Franck-Hertz experiment?

a: Electrons have mass Explanation

Explanation

b: Electrons emit electromagnetic radiation Explanation

Explanation

c: Atoms have quantized energy levels Explanation

Explanation

d: Electrons travel in circular orbits Explanation

Explanation

In the Franck-Hertz experiment with mercury, what is observed at 4.9 eV accelerating voltage?

a: The electron current remains constant Explanation

Explanation

b: Electrons are completely absorbed by mercury atoms Explanation

Explanation

c: The current sharply drops due to inelastic collisions Explanation

Explanation

d: The tube glows with visible light Explanation

Explanation

What is the function of the mesh grid in the Franck-Hertz apparatus?

a: To emit electrons Explanation

Explanation

b: To accelerate electrons toward the collector Explanation

Explanation

c: To detect excited atoms Explanation

Explanation

d: To cool the electrons after collisions Explanation

Explanation

Why does the neon-filled Franck-Hertz tube show a visible glow during the experiment?

a: Due to elastic collisions between electrons and neon Explanation

Explanation

b: Due to ionization of neon Explanation

Explanation

c: Due to de-excitation of neon atoms releasing visible light Explanation

Explanation

d: Because of heating by thermionic emission Explanation

Explanation

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